Android 快速退出应用程序

介绍几种快速退出android应用程序的方法：

1.通过设置栈底Activity的launchMode

Manifest

<!--将栈底Activity的launchMode设置为singleTask-->
<activity android:name=".MainActivity"
android:launchMode="singleTask">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

栈底Activity

//重写onNewIntent方法，finish掉自己
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
finish();
}

在需要退出的地方通过Intent跳转到栈底Activity即可退出整个应用了

2.通过给Intent setFlag

需要退出的Activity

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_third);
findViewById(R.id.exit).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//给Intent setFlag，将任务栈中栈底MainActivity之上的所有Activity finish掉
Intent intent=new Intent(ThirdActivity.this,MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
}
});
}

在跳转到的Activity

Intent intent = getIntent();
if ((Intent.FLAG_ACTIVITY_CLEAR_TOP & intent.getFlags()) != 0) finish();

3.通过Application和BaseActivity

定义全局ApplicationContext

public class ApplicationContext extends Application {
//定义List<Activity>，用来存放所有Activity实例
public List<Activity> activities=new ArrayList<>();

//重写onTerminate()，将所有Activity实例finish掉
@Override
public void onTerminate() {
super.onTerminate();
for (Activity activity : activities) {
activity.finish();
}
}
}

关联app

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme"
android:name=".ApplicationContext">

定义BaseActivity

public class BaseActivity extends Activity {
protected ApplicationContext app;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//将当前Activity加进集合
app= (ApplicationContext) getApplication();
app.activities.add(this);
}

@Override
protected void onDestroy() {
super.onDestroy();
//将当前Activity移除集合
app.activities.remove(this);
}
}

在需要退出的Acticity

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_third);
findViewById(R.id.exit).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//调用ApplicationContext的onTerminate()，finish掉所有未销毁的Activity实例
app.onTerminate();
}
});
}